So if you don't know the SOS calls, in any divine beast, in the background you can hear a Morse code that beeps "SOS" and "SAD" (Search and Destroy). But anyways all the DBs have them, but once you complete the last terminal for Vah Ruta, one of the Morse code signals becomes extremely deep in pitch... Possibly a dire call, Mipha was killed, or the last chance of getting someone's attention...
Gosh Botw is darker than I remember...
(Suggest listening with headphones for this one, easier to hear at the beginning of completing the terms, four or five seconds for that hearing window)
Ooga booga hope this isn't private property lol